{"id":15682,"date":"2026-09-18T06:25:13","date_gmt":"2026-09-18T06:25:13","guid":{"rendered":"https:\/\/www.examlabs.com\/certification\/?p=15682"},"modified":"2026-09-18T06:25:13","modified_gmt":"2026-09-18T06:25:13","slug":"juniper-jn0-664-practice-test-questions-and-exam-dumps-part4-q61-80","status":"publish","type":"post","link":"https:\/\/www.examlabs.com\/certification\/juniper-jn0-664-practice-test-questions-and-exam-dumps-part4-q61-80\/","title":{"rendered":"Juniper JN0-664 Practice Test Questions and Exam Dumps Part4 Q61-80"},"content":{"rendered":"

<\/h1>\n

View Full <\/b>Juniper JN0-664 Exam Dumps<\/b><\/a> and Practice Test Dumps.<\/b><\/h2>\n

 <\/p>\n

Question 61<\/b><\/h2>\n

Which protocol establishes routing adjacencies using hello packets?<\/b><\/p>\n

    \n
  1. OSPF<\/span><\/li>\n
  2. BGP<\/span><\/li>\n
  3. LDP<\/span><\/li>\n
  4. SNMP<\/span><\/li>\n<\/ol>\n

    Correct Answer: 1<\/b><\/p>\n

    Explanation:<\/b><\/p>\n

    OSPF uses Hello packets to discover neighboring routers and establish OSPF adjacencies. These packets are transmitted periodically through enabled OSPF interfaces and contain information required for neighbor identification and parameter negotiation. Routers use matching values, such as area information and timers, to determine whether an adjacency can be formed. BGP establishes sessions using TCP, LDP discovers peers through its own mechanisms, and SNMP is designed for network management rather than routing adjacency formation. Therefore, OSPF is the correct answer because Hello packets are fundamental to its neighbor discovery and adjacency process.<\/span><\/p>\n

    Question 62<\/b><\/h2>\n

    Which BGP state follows the TCP connection establishment?<\/b><\/p>\n

      \n
    1. Idle<\/span><\/li>\n
    2. Active<\/span><\/li>\n
    3. OpenSent<\/span><\/li>\n
    4. Connect<\/span><\/li>\n<\/ol>\n

      Correct Answer: 3<\/b><\/p>\n

      Explanation:<\/b><\/p>\n

      The OpenSent state occurs after a BGP speaker has successfully established the underlying TCP connection and sent an OPEN message to its peer. During this state, the router waits for and processes the remote peer’s OPEN message. If the received information is acceptable, the session progresses toward the Established state after the required exchanges. Idle represents the initial or restarting condition, Active indicates attempts to establish connectivity after certain failures, and Connect represents the stage where BGP is waiting for TCP connection establishment. Therefore, OpenSent is the correct state following successful TCP establishment.<\/span><\/p>\n

      Question 63<\/b><\/h2>\n

      Which protocol provides MPLS label distribution without traffic engineering?<\/b><\/p>\n

        \n
      1. RSVP-TE<\/span><\/li>\n
      2. LDP<\/span><\/li>\n
      3. BFD<\/span><\/li>\n
      4. PIM<\/span><\/li>\n<\/ol>\n

        Correct Answer: 2<\/b><\/p>\n

        Explanation:<\/b><\/p>\n

        LDP is commonly used to distribute MPLS labels according to the underlying IP routing topology without providing the explicit traffic-engineering capabilities associated with RSVP-TE. It establishes label bindings for Forwarding Equivalence Classes and enables routers to forward packets using MPLS labels. RSVP-TE adds traffic-engineering functions such as explicit path signaling and resource-related constraints. BFD focuses on rapid failure detection, while PIM handles multicast routing. Therefore, LDP is the correct answer because it provides conventional MPLS label distribution based primarily on existing IP routing information rather than explicitly engineered paths.<\/span><\/p>\n

        Question 64<\/b><\/h2>\n

        Which OSPF area connects other OSPF areas?<\/b><\/p>\n

          \n
        1. Area 10<\/span><\/li>\n
        2. Area 20<\/span><\/li>\n
        3. Area 100<\/span><\/li>\n
        4. Area 0<\/span><\/li>\n<\/ol>\n

          Correct Answer: 4<\/b><\/p>\n

          Explanation:<\/b><\/p>\n

          OSPF Area 0 is the backbone area and provides the central logical connection between other OSPF areas in a hierarchical design. Inter-area routing information is normally exchanged through the backbone, making Area 0 an important component of a properly structured multi-area OSPF deployment. Other area numbers can identify regular OSPF areas, but they do not automatically serve as the backbone. Maintaining appropriate connectivity to Area 0 helps ensure reliable inter-area route exchange. Therefore, Area 0 is the correct answer because it is specifically designated as the OSPF backbone area.<\/span><\/p>\n

          Question 65<\/b><\/h2>\n

          Which BGP attribute carries routing policy tags?<\/b><\/p>\n

            \n
          1. Community<\/span><\/li>\n
          2. Origin<\/span><\/li>\n
          3. Next Hop<\/span><\/li>\n
          4. AS Path<\/span><\/li>\n<\/ol>\n

            Correct Answer: 1<\/b><\/p>\n

            Explanation:<\/b><\/p>\n

            The BGP Community attribute allows administrators to attach policy-related tags to routes. These tags can identify groups of prefixes and provide a convenient mechanism for applying consistent routing policies. For example, an organization can classify routes according to customers, geographic regions, or desired policy treatment and then reference those communities in routing policies. Origin describes how a route entered BGP, Next Hop identifies the address used for forwarding, and AS Path records autonomous systems traversed by the advertisement. Therefore, Community is the correct answer because it is specifically designed to carry route classification information used in policy decisions.<\/span><\/p>\n

            Question 66<\/b><\/h2>\n

            Which Junos command displays concise interface information?<\/b><\/p>\n

              \n
            1. show interfaces terse<\/span><\/li>\n
            2. show route detail<\/span><\/li>\n
            3. show bgp summary<\/span><\/li>\n
            4. show system uptime<\/span><\/li>\n<\/ol>\n

              Correct Answer: 1<\/b><\/p>\n

              Explanation:<\/b><\/p>\n

              The Junos show interfaces terse command provides a concise summary of interface information. It commonly displays interface names, administrative states, operational states, and logical interface details without producing the extensive output generated by more detailed interface commands. This makes it useful for quickly checking whether interfaces are administratively enabled and operational. show route detail focuses on routing information, show bgp summary summarizes BGP sessions, and show system uptime reports system runtime information. Therefore, show interfaces terse is the correct answer when an administrator needs a compact overview of interface status.<\/span><\/p>\n

              Question 67<\/b><\/h2>\n

              Which MPLS label value indicates an implicit null operation?<\/b><\/p>\n

                \n
              1. 0<\/span><\/li>\n
              2. 1<\/span><\/li>\n
              3. 2<\/span><\/li>\n
              4. 3<\/span><\/li>\n<\/ol>\n

                Correct Answer: 3<\/b><\/p>\n

                Explanation:<\/b><\/p>\n

                In MPLS, label value 3 represents the Implicit Null label. It is used in label distribution mechanisms to indicate that the upstream router should remove the top MPLS label before forwarding the packet toward the advertising router. This behavior is commonly associated with penultimate-hop popping, where the penultimate router removes the outer label so the egress router does not need to perform that operation. Label 0 is associated with IPv4 Explicit Null, while other reserved values serve different purposes. Therefore, label value 3 is the correct answer for Implicit Null.<\/span><\/p>\n

                Question 68<\/b><\/h2>\n

                Which BGP mechanism advertises summarized prefixes?<\/b><\/p>\n

                  \n
                1. Route aggregation<\/span><\/li>\n
                2. Neighbor discovery<\/span><\/li>\n
                3. Label swapping<\/span><\/li>\n
                4. Packet policing<\/span><\/li>\n<\/ol>\n

                  Correct Answer: 1<\/b><\/p>\n

                  Explanation:<\/b><\/p>\n

                  BGP route aggregation allows multiple more-specific prefixes to be represented by a summarized route advertisement. This can reduce the number of routes carried between BGP speakers and simplify routing information exchanged across network boundaries. Aggregation can also help improve routing scalability when appropriately designed. Neighbor discovery is associated with protocols such as LLDP, label swapping belongs to MPLS forwarding, and packet policing controls traffic rates rather than routing advertisements. Therefore, route aggregation is the correct answer because it specifically allows multiple related prefixes to be represented by a summarized BGP route, reducing unnecessary routing-table detail.<\/span><\/p>\n

                  Question 69<\/b><\/h2>\n

                  Which Junos command displays the device uptime?<\/b><\/p>\n

                    \n
                  1. show system uptime<\/span><\/li>\n
                  2. show system alarms<\/span><\/li>\n
                  3. show chassis hardware<\/span><\/li>\n
                  4. show route summary<\/span><\/li>\n<\/ol>\n

                    Correct Answer: 1<\/b><\/p>\n

                    Explanation:<\/b><\/p>\n

                    The Junos show system uptime command displays information about how long the device and its relevant system processes have been running. This information can help administrators determine whether a system has recently rebooted and can provide useful context during troubleshooting. Comparing uptime with logs and recent configuration events may help identify whether an operational problem began after a restart. show system alarms focuses on active alarms, show chassis hardware displays installed hardware, and show route summary provides routing-table information. Therefore, show system uptime is the appropriate command for checking device uptime.<\/span><\/p>\n

                    Question 70<\/b><\/h2>\n

                    Which protocol transports MPLS VPN traffic across provider networks?<\/b><\/p>\n

                      \n
                    1. ARP<\/span><\/li>\n
                    2. MPLS<\/span><\/li>\n
                    3. NTP<\/span><\/li>\n
                    4. DHCP<\/span><\/li>\n<\/ol>\n

                      Correct Answer: 2<\/b><\/p>\n

                      Explanation:<\/b><\/p>\n

                      MPLS provides the label-based forwarding infrastructure used to transport VPN traffic across many service-provider networks. In an MPLS Layer 3 VPN architecture, provider routers use labels to carry packets across the core while maintaining customer-specific forwarding contexts at appropriate edge devices. ARP handles IPv4 address resolution, NTP synchronizes clocks, and DHCP provides network configuration information. These protocols do not provide the label-switching transport mechanism required by MPLS VPN services. Therefore, MPLS is the correct answer because it supplies the forwarding technology used to carry labeled VPN traffic through the provider network.<\/span><\/p>\n

                      Question 71<\/b><\/h2>\n

                      Which BGP attribute identifies the route’s forwarding next hop?<\/b><\/p>\n

                        \n
                      1. MED<\/span><\/li>\n
                      2. Community<\/span><\/li>\n
                      3. Next Hop<\/span><\/li>\n
                      4. Origin<\/span><\/li>\n<\/ol>\n

                        Correct Answer: 3<\/b><\/p>\n

                        Explanation:<\/b><\/p>\n

                        The BGP Next Hop attribute identifies the IP address that a router should use as the next-hop destination when forwarding traffic toward the advertised prefix. Proper next-hop reachability is essential because a route may be present in the BGP table but still be unusable if the next-hop address cannot be resolved through the routing system. MED provides path-selection information related to entry points, Community provides policy tags, and Origin identifies how a route entered BGP. Therefore, Next Hop is the correct answer because it directly identifies the forwarding address associated with a BGP route advertisement.<\/span><\/p>\n

                        Question 72<\/b><\/h2>\n

                        Which technology provides fast protection after link failure?<\/b><\/p>\n

                          \n
                        1. BFD<\/span><\/li>\n
                        2. NTP<\/span><\/li>\n
                        3. LLDP<\/span><\/li>\n
                        4. ARP<\/span><\/li>\n<\/ol>\n

                          Correct Answer: 1<\/b><\/p>\n

                          Explanation:<\/b><\/p>\n

                          BFD can provide rapid failure detection that allows associated routing or forwarding mechanisms to react quickly after a link or forwarding path becomes unavailable. By using short detection intervals, BFD can identify connectivity problems much faster than many traditional routing-protocol timers. This rapid notification can contribute to faster network convergence and improved service availability. NTP provides time synchronization, LLDP provides neighbor discovery, and ARP resolves IPv4 addresses to MAC addresses. Therefore, BFD is the correct answer because it is specifically designed to detect forwarding failures rapidly and notify dependent protocols so they can respond.<\/span><\/p>\n

                          Question 73<\/b><\/h2>\n

                          Which protocol carries routing information within one autonomous system?<\/b><\/p>\n

                            \n
                          1. BGP<\/span><\/li>\n
                          2. OSPF<\/span><\/li>\n
                          3. SNMP<\/span><\/li>\n
                          4. LACP<\/span><\/li>\n<\/ol>\n

                            Correct Answer: 2<\/b><\/p>\n

                            Explanation:<\/b><\/p>\n

                            OSPF is an Interior Gateway Protocol designed to exchange routing information within a single autonomous system. It uses link-state advertisements to build a topology database and applies the Shortest Path First algorithm to calculate routes. This makes OSPF suitable for internal enterprise and service-provider routing environments. BGP primarily provides interdomain routing, SNMP supports network management, and LACP controls link aggregation. Although BGP can also operate internally as iBGP, the protocol described as a conventional internal gateway routing protocol is OSPF. Therefore, OSPF is the correct answer for this requirement.<\/span><\/p>\n

                            Question 74<\/b><\/h2>\n

                            Which MPLS device usually adds customer VPN labels?<\/b><\/p>\n

                              \n
                            1. Provider core router<\/span><\/li>\n
                            2. Provider edge router<\/span><\/li>\n
                            3. Ethernet repeater<\/span><\/li>\n
                            4. DNS server<\/span><\/li>\n<\/ol>\n

                              Correct Answer: 2<\/b><\/p>\n

                              Explanation:<\/b><\/p>\n

                              A Provider Edge, or PE, router commonly participates in MPLS Layer 3 VPN services by maintaining customer VRFs and applying appropriate VPN labels to customer traffic entering the provider network. The PE router connects customer networks to the provider infrastructure and associates incoming traffic with the correct VPN forwarding context. Core provider routers generally transport the labeled traffic through the network rather than maintaining individual customer routing tables. An Ethernet repeater and DNS server do not perform MPLS VPN label operations. Therefore, the provider edge router is the correct answer for adding customer-specific VPN labels.<\/span><\/p>\n

                              Question 75<\/b><\/h2>\n

                              Which BGP feature prevents excessive route advertisements?<\/b><\/p>\n

                                \n
                              1. Route dampening<\/span><\/li>\n
                              2. Link aggregation<\/span><\/li>\n
                              3. VLAN tagging<\/span><\/li>\n
                              4. Clock synchronization<\/span><\/li>\n<\/ol>\n

                                Correct Answer: 1<\/b><\/p>\n

                                Explanation:<\/b><\/p>\n

                                BGP route dampening is designed to reduce the impact of unstable routes that repeatedly change state. Frequent route flapping can cause repeated advertisements and withdrawals, consuming resources and creating unnecessary routing churn. Dampening can temporarily suppress unstable routes based on configured thresholds and decay behavior, allowing the network to become more stable before accepting repeated changes. Link aggregation combines physical interfaces, VLAN tagging provides Layer 2 segmentation, and clock synchronization coordinates device time. Therefore, route dampening is the correct answer because it specifically addresses excessive routing updates caused by unstable route behavior.<\/span><\/p>\n

                                Question 76<\/b><\/h2>\n

                                Which Junos command examines detailed route information?<\/b><\/p>\n

                                  \n
                                1. show route detail<\/span><\/li>\n
                                2. show interfaces terse<\/span><\/li>\n
                                3. show system users<\/span><\/li>\n
                                4. show chassis alarms<\/span><\/li>\n<\/ol>\n

                                  Correct Answer: 1<\/b><\/p>\n

                                  Explanation:<\/b><\/p>\n

                                  The Junos show route detail command provides more detailed information about routes than the basic routing-table display. It can show additional attributes, protocol-related information, next-hop details, and other data useful when investigating route installation and selection. This level of detail is particularly helpful when multiple routing sources advertise similar destinations or when an administrator needs to understand why a specific route became active. The other commands focus on interfaces, logged-in users, and system alarms. Therefore, show route detail is the appropriate command for examining detailed routing information in Junos.<\/span><\/p>\n

                                  Question 77<\/b><\/h2>\n

                                  Which protocol supports Ethernet link aggregation negotiation?<\/b><\/p>\n

                                    \n
                                  1. LDP<\/span><\/li>\n
                                  2. LACP<\/span><\/li>\n
                                  3. OSPF<\/span><\/li>\n
                                  4. BFD<\/span><\/li>\n<\/ol>\n

                                    Correct Answer: 2<\/b><\/p>\n

                                    Explanation:<\/b><\/p>\n

                                    LACP, or Link Aggregation Control Protocol, is used to negotiate and maintain aggregated Ethernet links between compatible network devices. By combining multiple physical interfaces into one logical bundle, link aggregation can provide redundancy and increased aggregate bandwidth. LACP exchanges control information between participating devices to determine which links can form part of the bundle. LDP distributes MPLS labels, OSPF provides internal routing, and BFD detects forwarding failures. Therefore, LACP is the correct answer because it specifically handles the negotiation and maintenance of Ethernet link aggregation relationships.<\/span><\/p>\n

                                    Question 78<\/b><\/h2>\n

                                    Which routing protocol uses autonomous-system path information?<\/b><\/p>\n

                                      \n
                                    1. BGP<\/span><\/li>\n
                                    2. OSPF<\/span><\/li>\n
                                    3. RIP<\/span><\/li>\n
                                    4. LACP<\/span><\/li>\n<\/ol>\n

                                      Correct Answer: 1<\/b><\/p>\n

                                      Explanation:<\/b><\/p>\n

                                      BGP uses autonomous-system path information through its AS Path attribute. When routes are exchanged between autonomous systems, the path records the AS numbers through which the advertisement has traveled. BGP can use this information as part of its route-selection process and for preventing routing loops. OSPF maintains link-state topology information, RIP primarily uses hop count, and LACP manages aggregated Ethernet connections. Therefore, BGP is the correct answer because autonomous-system path information is a fundamental part of BGP operation and policy-based interdomain routing.<\/span><\/p>\n

                                      Question 79<\/b><\/h2>\n

                                      Which MPLS concept represents identical forwarding treatment?<\/b><\/p>\n

                                        \n
                                      1. FEC<\/span><\/li>\n
                                      2. VRF<\/span><\/li>\n
                                      3. ASN<\/span><\/li>\n
                                      4. LSA<\/span><\/li>\n<\/ol>\n

                                        Correct Answer: 1<\/b><\/p>\n

                                        Explanation:<\/b><\/p>\n

                                        A Forwarding Equivalence Class, or FEC, represents a group of packets that receive the same forwarding treatment within an MPLS network. Packets assigned to a particular FEC can be associated with the same label and follow an equivalent forwarding path or policy. FEC classification is central to MPLS because labels are used to identify how traffic should be handled through the network. VRF provides separate routing contexts, ASN identifies autonomous systems, and LSA is an OSPF link-state advertisement. Therefore, FEC is the correct answer because it specifically describes equivalent forwarding treatment for packets.<\/span><\/p>\n

                                        Question 80<\/b><\/h2>\n

                                        Which BGP message reports session-related protocol errors?<\/b><\/p>\n

                                          \n
                                        1. UPDATE<\/span><\/li>\n
                                        2. OPEN<\/span><\/li>\n
                                        3. KEEPALIVE<\/span><\/li>\n
                                        4. NOTIFICATION<\/span><\/li>\n<\/ol>\n

                                          Correct Answer: 4<\/b><\/p>\n

                                          Explanation:<\/b><\/p>\n

                                          BGP NOTIFICATION messages are used to report errors associated with BGP sessions and protocol processing. When a serious error occurs, a BGP speaker can send a NOTIFICATION message containing an error code and subcode before terminating the session. This helps the receiving administrator identify the general reason for the failure. OPEN messages establish session parameters, UPDATE messages exchange routing information, and KEEPALIVE messages maintain an established session. Therefore, NOTIFICATION is the correct answer because it is specifically designed to communicate BGP protocol errors and normally results in termination of the affected session.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

                                          View Full Juniper JN0-664 Exam Dumps and Practice Test Dumps.   Question 61 Which protocol establishes routing adjacencies using hello packets? OSPF BGP LDP SNMP Correct Answer: 1 Explanation: OSPF uses Hello packets to discover neighboring routers and establish OSPF adjacencies. These packets are transmitted periodically through enabled OSPF interfaces and contain information required for […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1648,1647],"tags":[],"_links":{"self":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/15682"}],"collection":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/comments?post=15682"}],"version-history":[{"count":1,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/15682\/revisions"}],"predecessor-version":[{"id":15712,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/15682\/revisions\/15712"}],"wp:attachment":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/media?parent=15682"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/categories?post=15682"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/tags?post=15682"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}